On this first day of 2010, here are the 10 New York gallery shows I most enjoyed this year. In the interest of variety, I've limited each gallery to one spot, leading to dubious and glaring omissions, such as the absence of David Zwirner's Dan Flavin show in favor of its marginally more revelatory 1000-Polaroid Philip-Lorca diCorcia exhibition. For all those interested, here is last year's list.